jetbrains.exodus.vfs.ClusterKey.kt Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of xodus-vfs Show documentation

Xodus is pure Java transactional schema-less embedded database

There is a newer version: 2.0.1

/**
 * Copyright 2010 - 2018 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jetbrains.exodus.vfs

import jetbrains.exodus.ArrayByteIterable
import jetbrains.exodus.ByteIterable
import jetbrains.exodus.bindings.LongBinding
import jetbrains.exodus.util.LightOutputStream

internal class ClusterKey(iterable: ByteIterable) {

    val descriptor: Long
    val clusterNumber: Long

    init {
        val iterator = iterable.iterator()
        descriptor = LongBinding.readCompressed(iterator)
        clusterNumber = LongBinding.readCompressed(iterator)
    }

    companion object {

        @JvmStatic
        fun toByteIterable(fd: Long, clusterNumber: Long): ArrayByteIterable {
            val output = LightOutputStream(8)
            val bytes = IntArray(8)
            LongBinding.writeCompressed(output, fd, bytes)
            LongBinding.writeCompressed(output, clusterNumber, bytes)
            return output.asArrayByteIterable()
        }
    }
}